\documentclass{article}
\usepackage{amssymb,amsmath,amscd,concmath}
\pagestyle{empty}
\begin{document}
\begin{equation*}\frac{D^3F(P_0)}{DP^3}=\frac{D^2F'(P_0)}{DP^2}=\frac{DF''(P_0)}{DP}=\frac{F''(P_1\!<\!P\!<\!P_3)-F''(P_0\!<\!P\!<\!P_2)}{P_1-P_0},\,\!\end{equation*}
\end{document}
